靶场时统中自适应Loran-C接收机的研究  

Research on Loran-C adaptive receiver in range time series system

作　　者：熊伟[1] 胡永辉[1] 钱建立[2] 梁青[3] 

机构地区：[1]中国科学院国家授时中心 [2]空军工程大学电讯工程学院 [3]西安邮电学院电子与信息工程系

出　　处：《固体火箭技术》2008年第3期303-306,共4页Journal of Solid Rocket Technology

摘　　要：针对运载火箭的时间同步问题,提出了一种基于ESPRIT算法估计Loran-C接收机天波延迟的信号处理新技术,为设计具有自适应调节最佳采样点的Loran-C接收机打下良好的基础。利用频谱相除技术构建了延迟时间测量的信号模型,研究了频谱相除后信号的幅频特性。针对通带外噪声被放大的现象,提出频域加窗的措施。最后,提出用ESPRIT算法估计了天波延迟,避免了诸如AR、ARMA、MUSIC等算法在整个时域计算参数的弊端,更适合于适时应用。仿真结果表明,频域加窗影响识别天波的分辨率,ESPRIT算法能够正确估计天波的延迟,而且比FFT具有更高的分辨率。Aiming at time synchronous problem of launch vehicle, a kind of signal treatment technique for estimating skywave delay of Loran-C receiver was put forward based on ESPRIT algorithm, which can lay good foundation for designing the Loran-C adaptive receiver with the optimum sampling point. The spectrum division technique was used for establishing signal model of delay time measurement, and amplitude frequency characteristics of the signal after spectrum division was investigated. Frequency-domain plus window measures were put forward for amplification phenomena of pass band external noise. Finally the ESPRIT algorithm was proposed to estimate skywave delay, avoiding the disadvantages of calculating parameters of AR, ARMA MUSIC algorithms at whole time domain. The ESPRIT algorithm is more suitable for real-time application. The simulation results show that frequency-domain plus window can affect resolution of skywave identification, and the ESPRIT algorithm can accurately estimate skywave delay, which has higher resolution than FFT.

关 键 词：LORAN-C 天波识别 频谱相除 ESPRIT 

分 类 号：V556[航空宇航科学与技术—人机与环境工程]